Domestic garbage incineration fly ash water washing chlorine-removing and waste water desalination and reuse process system

Abstract

The invention relates to the technical field of waste incineration fly ash treatment, and discloses a domestic garbage incineration fly ash water washing chlorine-removing and waste water desalinationand reuse process system. A process comprises the steps of step 1, collecting fly ash from waste incineration and transport the fly ash to a pre-mixing tank for mixing through a seven mile conveyingdevice of a silo to obtain slurry; and step 2, washing the slurry obtained in step 1 through a primary water washing tank, and then centrifuging by a primary horizontal centrifuge, and then producingmud cake a and filtrate a after centrifugation. By combining multi-stage elution systems to give full play to the unique advantages of water washing chlorine-removing for the resource utilization of the fly ash and the recycling of heavy metals, and to simultaneously realize the efficient removal of pollutants such as chloride ions and heavy metal ions. The system can reduce the cost of fly ash disposal, reduce heavy metal pollution, and realize the harmless and resource utilization of fly ash. The system has low energy consumption, low investment and low operating costs, and is convenient inuse, mild in operating conditions, low in operating costs and high in recovery rates.

Description

technical field [0001] The invention relates to the technical field of waste incineration fly ash treatment, in particular to a process system for water-eluting chlorine from domestic waste incineration fly ash and desalination and reuse of waste water. Background technique [0002] With the continuous promotion of domestic waste incineration treatment methods, the amount of waste incineration fly ash is also increasing. Generally, the incoming garbage of municipal waste incineration power plants contains a large amount of kitchen waste and plastic product waste. These two kinds of garbage are the main components of domestic waste. Garbage will produce waste incineration fly ash with chlorine content greater than or equal to 2%. At the same time, with the country's rapid economic construction and development, various kilns have sprung up on the land of the motherland. These kilns will produce different amounts of kiln dust during the incineration or calcination process. Th...

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Problems solved by technology

[0003] For the reprocessing of waste incineration fly ash and kiln dust with high chlorine content, there will be certain safety hazards, such as the risk of increased leaching of heavy metals and other pollutants, and the stability of solidification or stabilization of waste incineration fly ash Bring hidden risks. At present, only a few cities in the country are dealing with domestic waste incineration fly ash. On the one hand, the cost of fly ash treatment is very high. On the other hand, due to the irregular market and inadequate supervision, there is a problem of vicious competition. If the "fly ash" is in a "flying random" state, the fly ash cannot be safely disposed of, which will be a great hidden danger to the environment. Therefore, a process system for the dechlorination of domestic waste incineration fly ash water and the desalination and reuse of wastewater is sought. It is of practical significance to realize the resource utilization of domestic waste incineration fly ash

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